Abstract
Results of an experimental, analytical study of the postbuckling of selected graphite-epoxy stiffeners subjected to static and cyclic axial compression loading are presented. Postbuckling behavior and failure characteristics are described. Stiffener sections include I and J shapes, commonly used in stiffened panels, with a 12-ply skin attached. Failure of all specimens, regardless of shape, was associated with cap delaminations and cracks and fiber breakage in the attached skin. Analytical results from a computer program analysis of a nonlinear stiffened panel correlated well with postbuckling test results. The analytical modeling necessary to predict accurately the response of the stiffener is described. The cyclic loading has a favorable effect on the failure loads compared with the statically loaded specimens.
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